Question: is the {start time} for {New York City} has {head of government} as {Robert F. Wagner} ?
Paraphrase: is the {begin time} for {Unused York City} has {head of government} as {Robert F. Wagner} ?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q60 p:P6 ?s . ?s ps:P6 wd:Q439156 . ?s pq:P580 ?value}